Browsing Earth, Atmospheric, and Planetary Sciences - Bachelor's degree by Title
Now showing items 82-101 of 197
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H107[alpha] recombination-line emission, 4800-MHz and 1666-MHz continuum emission in the HII region RCW38
(Massachusetts Institute of Technology, 2003)We present results from observations of H107[alpha] recombination-line emission and the related 4800 MHz continuum emission of the HII region RCW 38 using the Australia Telescope Compact Array. We find the continuum emission ... -
High precision U/Pb geochronology on the Cenomanian Dakota Formation, Utah : implications for paleobotany and the transgression of the Western Interior Seaway preceding Oceanic Anoxic Event 2
(Massachusetts Institute of Technology, 2010)The Dakota Formation was deposited during the Cenomanian, a time when the Western Interior Seaway spanned much of North America. The Dakota Formation contains a rich record of plant and animal fossils. Key to understanding ... -
High-precision U/Pb dating of the Cenomanian-Turonian boundary Kaiparowits Plateau, Utah
(Massachusetts Institute of Technology, 2012)The massive marine species turnover at the Cenomanian-Turonian boundary is associated with Oceanic Anoxic Event 11 (OAE II) and is often identified by an increase of a13C in the carbon isotopic record. A high-precision ... -
Hillslope evolution in response to lateral base level migration
(Massachusetts Institute of Technology, 2010)Hillslopes evolve in response to base level change, sediment production, and sediment transport. Many previous studies have focused on hillslopes undergoing vertical base level migration due to tectonic forcing and bedrock ... -
Ice and the apparent variation of GPS station positions for Alaska
(Massachusetts Institute of Technology, 2015)Most GPS stations in Alaska show apparent seasonal variations on the order of one centimeter. The majority of these stations move downwards throughout the winter, a motion which is in phase with regional snowfall and has ... -
Ice-rafted debris in the Southern Ocean : potential uses and limitations of ²³⁰Th-normalized fluxes
(Massachusetts Institute of Technology, 2014)We measured IRD fluxes from 22-5 ka BP in two sediment cores from the Scotia Sea using two different methods. The first, commonly used method, uses the linear sedimentation rate (LSR), dry bulk density, and weight percent ... -
Identifying binary central stars of planetary nebulae with Kepler K2 campaign 11 photometric data
(Massachusetts Institute of Technology, 2018)A large majority of planetary nebulae (PNe) are non-spherical, and many have complex structures; these are unlikely to be created trivially by a single central star. The Binary Hypothesis proposes that the complex morphologies ... -
Imaging of the Hellenic subduction zone by seismic tomography
(Massachusetts Institute of Technology, 2008)The Hellenic subduction zone is a complicated tectonic boundary, along which transitions in the nature of subducted material are believed to occur. The objective of this study was to better constrain the subsurface geometry ... -
Impact modification of Mercury's mantle composition
(Massachusetts Institute of Technology, 2011)Difficulties encountered in reproducing Mercury's compositional attributes through modeling of formational processes have bolstered support for the hypothesis that one or more giant impacts stripped away a significant ... -
The impact of Arctic cloud water and ice on cloud radiative forcing during the Arctic Summer Cloud-Ocean Study in August 2008
(Massachusetts Institute of Technology, 2010)The Arctic atmosphere is especially sensitive to changes in climate forcing; however, Arctic processes and feedbacks are not understood well enough to accurately predict how the Arctic environment might change under ... -
The influence of the Atlantic Meridional Mode on the frequency, duration, and intensity of tropical North Atlantic cyclones
(Massachusetts Institute of Technology, 2007)This paper describes the Atlantic Meridional Mode (AMM) and its influence on tropical storm activity in the North Atlantic Basin. The Atlantic Meridional Mode is the oscillating sea- surface temperature (SST) gradient ... -
Investigation of regional variation in Lunar crater morphometry from (Lunar Orbiter Laser Altimeter) LOLA observations
(Massachusetts Institute of Technology, 2011)The advent of global Digital Elevation Models of the lunar surface, obtained from the Lunar Orbiter Laser Altimeter (LOLA), has allowed for a quantitative assessment of crater morphometry. 351 simple and complex craters ... -
An investigation of the catalytic effect of ferric oxide on the sulphating of metallic oxides
(Massachusetts Institute of Technology, 1916) -
Investigation of the depth and diameter of simple craters in the lunar mare
(Massachusetts Institute of Technology, 2012)Using altimetry data from the Lunar Orbiter Laser Altimeter (LOLA), the depths and diameters of 1429 simple craters in six different lunar maria units were measured, The analysis utilized a Graphical User Interface that ... -
Investigation of the heterogeneous ice nucleation potential of sea spray aerosol
(Massachusetts Institute of Technology, 2018)Bubble bursting at the ocean surface generates smaller film-burst particles and larger jet drop particles that differ in composition. The chemical composition of sea spray aerosols is an important parameter for the evaluation ... -
An investigation on the coking properties of a Mexican coal
(Massachusetts Institute of Technology, 1901) -
Killer asteroids : feasibility of using the IRTF to track near-earth objects
(Massachusetts Institute of Technology, 2006)The possibility of an asteroid or comet impact necessitates the tracking and cataloging of all such objects which could potentially impact Earth. Currently, no comprehensive catalog of Near Earth Objects (NEOs) exists which ... -
Lability of dissolved organic carbon in Arctic rivers on the North Slope of Alaska
(Massachusetts Institute of Technology, 2007)Rivers are an important pathway of organic carbon-mobilization in the arctic, and their influence is projected to grow as precipitation and soil temperatures increase in response to highlatitude warming. This study addresses ... -
Local and expert knowledge in experienced mining communities : the case of a proposed uranium mine in Crownpoint
(Massachusetts Institute of Technology, 2007)Public access to science is an essential environmental justice component of any mining development. Both limited public access to professional scientific knowledge and little acknowledgment by professionals of the contributions ... -
Low rare earth element concentration impact glass from the K/T Boundary at Beloc
(Massachusetts Institute of Technology, 2011)This paper seeks to describe an impact glass from the K/T boundary layer at Beloc that is depleted in rare earth elements (REE) relative to continental crust. It is widely agreed that a large bolide struck the Yucatan ...
